fix: clear resolved evidence gaps after a successful scoring retry

backend/tests/test_optimization.py

@@ -607,6 +607,9 @@ def test_scoring_retry_carries_target_contract_and_specific_repair_feedback(sqli
                  "description": "实现方法", "required_evidence": ["实验数据", "实现方法"]}
     created = services.create_batch(SimpleNamespace(course_version_id=1, rubric_version_id=1), db)
     batch = db.get(ScoringBatch, created["id"])
+    db.add(CriterionScore(batch_id=batch.id, project_id=item.id, criterion_id=criterion["criterion_id"],
+                          status="needs_review", evidence_gaps=[{"target_id": "t1", "reason": "上次未命中正文"}]))
+    db.commit()
     class Client:
         calls = 0
         def json_call(self, prompt, payload, *args, **kwargs):
@@ -626,6 +629,7 @@ def test_scoring_retry_carries_target_contract_and_specific_repair_feedback(sqli
     score = _score_criterion(db, batch, item, criterion, client,
                              retriever=lambda *args, **kwargs: [], multi_retriever=selected)
     assert score.status == "scored" and client.calls == 2
+    assert score.evidence_gaps == []
 
 
 @pytest.mark.parametrize("version", [None, 1])